15/05/2026
IMPORTANT NOTE ON WEIGHT LOSS JABS
If you’re on a GLP-1, you probably need to train each muscle MORE often than a natural lifter. Not the same. More.
I know how that sounds. Let me walk you through it.
A quick history lesson
In the pre-steroid era of bodybuilding, the best lifters in the world trained the full body, frequently. Two or three full-body sessions per week was the standard. Not because they were doing it “wrong” — but because that’s what worked for a drug-free human.
Then anabolics arrived.
Steroids dramatically extend the muscle protein synthesis window.
MPS stays elevated for days after a session instead of hours. Which meant a lifter could blast chest on Monday, leave it alone all week, and still grow. The bro split was born — chest day, back day, leg day, shoulder day, arm day. One muscle per week.
That worked. For that population.
For a drug-free lifter? MPS only lasts 24-48 hours. Once-a-week frequency was never going to be optimal. The research is clear — natural lifters do better with 2-3x per week per muscle. This isn’t controversial anymore.
Now apply the same logic to GLP-1s
GLP-1s aren’t anabolic. They’re closer to the opposite.
Appetite drops. Calories drop. Protein intake gets harder to hit consistently. Training energy drops. And without intentional effort, muscle quietly leaves the building.
A GLP-1 user isn’t just “a natural lifter who eats less.” Every variable that influences muscle retention is compromised:
Caloric deficit blunts MPS. Studies on energy restriction show the MPS response to both training and protein is reduced. The spike is smaller than it would be at maintenance.
Lower protein intake means some meals miss the leucine threshold entirely. When you’re not hungry, getting 30-40g of quality protein in a sitting takes effort. Skip it, and that meal doesn’t maximally stimulate MPS — it just keeps you alive.
Deficit raises muscle breakdown. Net protein balance is the equation that matters, and the breakdown side gets louder when energy is restricted.
Low energy means a weaker training stimulus. You can’t push the same loads, the same intensity, the same volume when you’re under-fueled.
So the question becomes — if every individual anabolic event is smaller, and the catabolic baseline is higher, what’s the logical response?
More frequent stimulation. More shots on goal. Because each shot is worth less.
The case for training more, not less
This is where I think the conventional advice gets it backwards. The instinct when someone is on a GLP-1 — fatigued, eating less, recovering slower — is to reduce training. Pull back. Take it easy.
That’s exactly the wrong move for muscle retention.
What you actually want is more frequent contact with each muscle, at lower volume per session. You’re not trying to crush them. You’re trying to keep telling the body “we still need this tissue, please don’t take it.”
A natural lifter in maintenance might thrive on 2x per week per muscle. A GLP-1 user might benefit from 3x per week, or even daily low-volume exposure to specific muscles. Not more work — more frequency.
What I’d recommend if I was coaching you directly
Hit each muscle 3x per week, minimum. Full body programs work much better than body part splits here.
Heavy compounds get priority. Squats, deadlifts, presses, rows, chin-ups. These are the lifts that send the loudest “keep this tissue” signal. This isn’t the season for tricep kickbacks.
Protein is non-negotiable. Even when food sounds awful. Especially when food sounds awful. Hit 0.8-1g per pound of target bodyweight. Liquid protein counts and is often easier.
Cut the junk volume. Quality sets only. In a deficit, every set has a cost — make sure they’re paying for themselves.
Don’t chase pumps. Chase strength retention. Are you still hitting close to the same loads? That’s the metric. If strength is dropping fast, the protocol needs adjusting.
Bottom line
Anabolics extend the anabolic signal. So users can train each muscle less often and still grow.
GLP-1s dampen the anabolic signal. So users need to train each muscle more often just to maintain.
Opposite drugs. Opposite playbooks.
The fitness industry hasn’t caught up to this yet. Most GLP-1 users are getting cookie-cutter “train 3 days a week, do some cardio” advice from people who haven’t thought through what the drug actually does to muscle. That’s a coaching gap, and it’s costing people the muscle they spent years building.
If you’re on a GLP-1 — or coaching someone who is — train accordingly.
•Alwyn Cosgrove•
